Stats

Locked Locked
Replies 5
Subscribers 91
Views 15174
Members are here 0

This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

signoff timing analysis in MMMC mode

Hi,

I am trying to do MMMC signoff timing analysis in encounter. The first method I tried was to just use timeDesign -signoff. However, when defining create_rc_corner in MMMC mode, we need to provide -qx_tech_file qrc.tch -qx_conf_file qrc.config for encounter to run qrc extraction. I am not sure about the format and the content of this qrc.config file ? I would appreciate if anyone could provide some sample qx_conf_file.

The second method I am trying is generating .SPEF file by running standalone QRC extraction for the design. Then use the following flow in encounter:

setAnalysisMode -analysisType onChipVariation -asyncChecks async -caseAnalysis true -clockGatingCheck true -clockPropagation sdcControl -cppr both -propSlew true -timingSelfLoopsNoSkew true -skew true

set_analysis_view -setup worst -hold best

spefIn -rc_corner rc_worst $spef_dir/foo_qrc.spef_worst.spef
spefIn -rc_corner rc_best $spef_dir/foo_qrc.spef_best.spef

timeDesign -signoff -reportOnly -pathReports -drvReports -slackReports -numPaths 50 -prefix wstbst -outDir SIGNOFF_TIMING/wst_bst/
timeDesign -signoff -reportOnly -hold -pathReports -slackReports -numPaths 50 -prefix wstbst -outDir SIGNOFF_TIMING/wst_bst/

Is this the correct flow? Do I still need to do consider

set_analysis_view -setup typical -hold typical and

spefIn -rc corner rc_typcial $spef_dir/foo_qrc.spec_typical.spef and do the

timeDesign -signoff -reportOnly

Actually, I am unclear how timing analysis should be done in encounter when reading in externally generated SPEF in MMMC mode. Any suggestion of the flow to do this will be highly appreciated.

Thanks for your time.

Parents

Scrivner over 15 years ago

Thanks Kari. I didn't realize -signoff ran qrc extraction internally. I've always run qrc separately and then used -reportOnly for timing analysis.

Thanks again!
Cancel
Vote Up 0 Vote Down

Cancel

Reply

Scrivner over 15 years ago

Thanks Kari. I didn't realize -signoff ran qrc extraction internally. I've always run qrc separately and then used -reportOnly for timing analysis.

Thanks again!
Cancel
Vote Up 0 Vote Down

Cancel

Children

No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.